Dust-separating and steam-generating apparatus.



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HARRY J. SEAMAN, F CATASAUQUA,A PENNSYLVANIA.

DUST-SEPABTHG AND STEAM-GENERATING APiPARATUS.

Spec-Mention of Letters Patent.

Patented May'30, 1916.

Application tiled 3.9M, Sei-iai No. 875,566.' Renewed January 19, 1916.Serial No. 73,070.

To all whom muy analisi-uric.' y

Be it knawn that 3` HARRY JL SEA'MAN, a citizen cr'i the 'trinite-filStates, and resident of Cata. *amy of Lehigh, and State i. have made acertain new and useful invention Relating to Dust-Separating andSteam-Generating Apparatus, of which the followin is a specification,taken in connection Wit the accompanying drawings, which form part ofthe same.

This invention relates especially to apparatuffon separating thesuspended particles of dustor fumes from the furnacegases dischargedfrom rotary cement kilns or other furnaces and at the same timeutilizingthevheat contained in these furnace gases for thel generationof steam. The appara 'tus preferably comprises a boiler containing anumber of large area vertical tubes throu h which the hot furnace gasesare passe preferably in a downward 'direction and there is also arrangedwithin each of these gas tubesror heating passages one or more highlycharged electric conductors which by their electrostatic action separatefrom the gases dust and fumes and cause theiricollectionon the inside ofthese tubes, while at the same time promoting the trans- -mission of theheat in thc gases through the convection effects caused by these highpotential charges.

i In the accompanying drawing showing in a somewhat Ydiagrammatic wayan'illustrative embodiment of.. this invention Figure lis an elevationpartly in section; and Fig. 2 is a transverse sectional view taken sub-`stantially alo the line 21-2 of Fig. 1 and looking upwaril. 1

By way of illustration the apparatus is shown as arranged in connectionwith-a i'otaryPortland cement kiln from which the dust laden gases aredischarged at temper; atures of about 1.090 degrees Fahrenheit or so,although it is of 'course understood that hot furnace gases from anyother metallurgical or other furnace may be treated in this apparatus.The cement Vkiln 1 'may have the usual steel shell and bearingrihgs '2and may be provided with a lining 3 of fire-brick or other suitablematerial a pted to withstand the high working temperatures. The lowerend of this s ightl clinedkiln which is rotated by any suitable meanspreferably `projects within the 1firing liood 4 formed cr lined withmasonry dr the like which may advantageously form a suband air and drivethe same substantially.

axially up the kiln for eflicient combustion. The raw cement materialconsisting of the finely pulverized mixture of argillaceous Amaterialmay be fed into the upper end of the kiln in any desired way andgradually passes down through the rotating kiln in which it is firstcalcined and then clinkered or fused into rough granular balls or masseswhich are discharged at white heat into the hood andl may pass throughthe clinker chute 14 through which air may be drawn for combustion inthe kiln and be more or lessheated by the hot clinker.

The upper end of the kiln may copcrate with the housing 7 preferablyforming a substantially tight joint therewith and leading the hotfurnace gases through the gas conduit 8 int'o one or more suitable dustseparating boiler units where the dust and fumes may be removed to thedesired extent b v any suitable electrostatic devices preferablyincreasing the heat transfer action.

As indicated this boiler dust separator unitwof which any desired numbermay be connected to a single cement kiln so as to be used simultaneouslyor in alternation as desired, may have a steel shell such as of anydesired size, shape and construction and provided with aheavy lagging 21of asbestos or other heat-insulating material. This boiler shell mableconveniently formed as a cylindrical ell vertically .arranged andprovided with tube sheets such as 27, 28 secured in position lin anydesired way so as to form a gas chamber 22 above the tubes and acollecting chamber 23 below them of ample capacity to allow for thesettling and col'ection of the dust before the gases are dischargedythrough a suitable discharge flue, such as 25. Gas tubes ofany desiredshape and constructiolina'y be provided for the passage of the hotfurnace gases and if desired the vertical cylindrical -tubes 29 whichare mounted within these tube sheets may have,l the unusually largediameter of ten to fifteen inches or so and a length of ten totwentyteet according to the vcondibe intlie form of biocks or members ofsteel or other material mounted on the curved spring or other resilientarms 34 by which they are connected to the striker rods 35 eX- tendingtransversely through the collecting chamber and geared together orotherwise simultaneously oscillated from time to time so as to forciblybring' all these strikers in connection with their coperating reinforcedtube ends and thus cause suicient impact and vibration efects throughout.the

tubes to dislodge the adherent coating of dust from their insidesurface. Under these conditions the dust falls to the bottom of thecollecting chamber from which it may be removed as by the screw conveyer24, this settling action being facilitated by momentarily shutting ofi'the supply of gases to the apparatus as by entirely or partly closingthe cut-off'valve 86 and taking care of the kiln gases in some otherWay.

The gastubes 29 may be provided with one or more electric conductors',such as 30, Within each tube and if desired extending substantiallycentrally throughout the same. These conductors may be connected to thesupporting rods or conductors 31 at either end of the tube which may besupported and insulated in any suitable Way and kept charged withelectricity at the desired high potential of 30,000 to 50,000 volts ormore by a rectiying transforming appara-tus supplying such high tensionelectric current of a uni-directional or substantiallyconstantcharacter. These electrified conductors 'effect the rapid separation ofthe particles of dustand fumes from the furnace gases passl ing throughthese separating tubes, the particles of dust being driven byelectrostatic action outward toward the walls of the tube and adheringthereto or falling down through the tube to the bottom of the enlar'gedcollecting chamber below so as to be removed therefrom by, the dischargecon- V'veyer 24' and utilized as by the recovery of potash and reburningtlie residue in cement kilns or otherwise in the case of the dustseparated from cement kiln gases. This separating action is considerablypromoted by claims.

of the gases and considerabiy promotes the 1,.

separation of dust particies therefrom. The highly charged electrostaticseparating elements also cause convection effects in the hot gases andthus promote the transfer of heat from the gases to the tubes and to thesurrounding steam and water. At the same time the temperature of thesteam in ordinary boiler practice is considerably above the temperatureat which'any water vapor can condense in the furnace gases passingthrough these heating tubes at atmospheric pressure so that theelectrical action of the apparatus is not impaired. It is furthermore.,possible to secure still greater utilization of the heat in the gases byusing them to generate steam at low pressure and correspondingly lowerten'iperature so that the tube walls may be kept as low as a few hundreddegrees Fahrenheit where the steam is generated at five to ten poundspressure or so per square inch and utilized for steam turbine Work tosupplement the exhaust from other steam engines, tor example. In thisway a large proportion of the heat in the iriln gases may be utilizedand at thel same time the efiiciency and thoroughness of the, dustseparation increased. I

This invention has been described in connection with a number ofiilustrati've embodiments, forms, proportions, materials andarrangements of parts, vto the details of which disclosure the inventionis not fof course to be limited, since what is claimed as new and whatis desired to be secured by Letters Pateit is set forth in the appendedI claim: l

asA

l. In appairatus for separating the dust i from the hot' .gasesdischarged from rotary Portland cement kilns and for generating steamtherefrom, ".a vertically arranged cylindrical boiler shell providedwith internal tube sheets to form a, gas chamber adjacent the top of theshell and an enlarged i collecting chamber adjacent the bottom of 4,theshell, a discharge conveyer extending into said collecting chamber todischarge/the dust collected therein, a gas conduit communicating withsaid gas chamber to supply hot furnace gases from a rotary cement kilnto said gas chamber and cause their passage down through said gas tubesand supply heat to the water around said tube, a discharging tine forsaid gases communieating with said collecting chamber, large. dia-metervertical gas tubes mounted in said tube sheets' and having reinforcedends eX- tending below the lower tubesheet. strikers resiliently mountedon oscillating striker rods to cooperate with said reinforced tube endsand dislodge the adherent dust within said tubes and highly chargedelectric separating conductors extending substantially axially throughsaid tubes separating the suspended dust from the furnace gases passingthrough said tubes and promoting the transfer of heat 'from said gases.

2. In apparatus for separating the dust from the hot gases dischargedfrom rotary lortland cement kilns and for generating steam therefrom. avertically arranged cylindrical boiler shell provided with internal tubesheets to forni a gas chamber adjacent the top of the shell and anenlarged collecting chamber adjacent llihe bottom of the shell, a gasconduit comii'iunicating with said gas chamber to supply hot furnacegases from a rotarjiY cement kiln to said gas chamber and causetheirpassage down through said gas tubes and supply heat to the wateraround said tubes` a discharging flue for said gases eonnnuni ating withsaid collecting chamber. large diameter vertical gas tubes mounted insaid tube sheets and highly charged electric separating conductorsextending substantially axially through said tubes and promoting thetransfer of heat from said gases.

3. In apparatus for separating the dust from the hot gases dischargedfrom rotary Portland cement kilns and for generating steam therefrom, avertically arranged cylindrical boiler shell provided with a cooperatinggas chamber adjacent the top of the shell and an enlarged collectingchamber adjacent the bottom of the shell, a discharge conveyer extendinginto said collecting chamber to discharge the dlist collected therein,Ya gas conduit communicating with said gas chamber to supply hot furnacegases from a rotary cement kiln to said gas chamber and cause theirpassage down througlr said gas tubes and supply heat t0 the water aroundsaidh tubes, a discharging flue for said gases communicating with saidcollecting chamber. large diameter vertical gas tubes mounted in saidboiler shell and having reinforced ends extending below the same,strikers resiliently mounted on oscillating striker rods to cooperatewith said neinforccd tube ends and dislodge the adherent dust withinsaid tubes and highly charged electric separating conductors extendingsubstantially axially through said tubes separating the suspended dustfrom the furnace gases assing throu h said tubes and permitting t etransfer o heat from said ases.

4. n apparatus for separating the dust from hot furnace gases and forgenerating steam therefrom, a vertically arranged boiler shell providedwith a cooperating gas chamber adjacent the top of the shell and an:enlarged collecting chamber adjacent the bottom ofthe shell, a gasconduit communieating ywith said gas chamber to supply hot furnace gasesfrom a rotary cement kiln to said gas chamber and cause. their passagethrough said gas tubes and supply heat to the water around said tubes,large diameter Vertial gas tubes mounted in said boiler shell and havingends extending below the same, strikers to ciperate with said reinforcedtube ends and dislodge the adherent dust within said tubes and highlycharged electric separating conductors extending through said tubesseparating the suspended from the furnace gases passing through saidtubes and promoting the transfer of heat from said gases,

5. ln apparatus for separating the dust from hot furnace gases and forgenerating steam therefrom` a vertically arranged boiler shell providedwith a cooperating gas chamber adliaieniV the top of the shell and anenlarged collecting chamber adjacent the bottoni of the shellN verticalgas tubes mounted in said boiler shell and haring ends extending belowthe same, strikers to cooperate with said reinforced tube ends anddislodge the adherent dust within said tubes and highly charged electricseparating con ductors extending through said tubes separating thesuspended from the furnace gases passing through said tubes andpromoting the transfer of heat from said gases,

t3. ln dust separating steam generating apparatus` a boiler shellprovided with tube sheets, larg, arca gas tubes mounted in said tubesheets and arranged substantially ver- 1 tieally, a dust collectingchamber communieating with the lower ends of said tubes, means todislodge into said chamber the dust adhering to the inside of saidtubes, means to pass the dust laden hot furnace gases through said tubesto supply heat to the water around them and electrostatic separatingconductors extending through said tubes separating the dust from thegases passing through said tubes,- and simultaneously proinotin thetransfer lof heat therefrom.

7. n dust separating steam generating apparatus, a boiler shell providedwith tube sheets, large area gas tubes mounted in said tube sheets andarranged substantiallv vert'ically, means to dislo ge the dust adheringto the inside of said tubes; means to pass the dust laden hot furnacegases through said tubes to supply heat to the water around them andelectrostatic separating conductors extending through said tubes separating the dust from the gases passing through said tubes andsimultaneousl y proinotii'ig the transfer of heat therefrom.

8. In dust separating steam generating apparatus, a boiler provided withlarge area gas passages arranged substantially vertically, a dustcollecting chamber communi eating with the lower ends of said passages,means to dislodge into said chamber the dust :noting the adheringI 'lo sid passages, means to pass the dust laden hor fi ace gas/rs down throughsaid passages to supply heat to the adjacent water and, electro ticseparating conductors estendimt thi .ugh passages separating the dustfrom the gases passing through said tubes and simidtaneously prouVransfer of heat tl'ierefrom.

9. ln dust separating steam generating apparatus, a boiler provided withgas pas sages arranged substantially vertically, a dust collectingchamber eoinnnmicating with the lower' ends of said passages, means todislodge into said chamber the dust adhering to said passages, means topass the dust laden hot furnace gases down through said passages tosuppl; beat to the adjacent water and elrcinstatic .ming cendrietorsseparatingj the dust 1' 1 the fases pass ing through said tubes andsimultaneously 'promotie the transfer of heat therefrom., vl0. Inseparating 'i generating appzxrat'uf-i. :i boiler prmideil with gaspar'- sages, a dusteollerting chamber communieating with said passages,means to dislodge into said chamber the dust adhering to vsaid passages,means to pass the dust laden hot furnace gases through said passages tosupply heat to the adacent water and electrostatic separating conductorsseparating the dust from the gases passing through said tubes andsimultaneously promoting the transfer of heat therefrom.

1l. In dust separating steam generating apparatus, a boiler providedwith large area gas tubes mounted and arranged substantially vertically,a dust ctllecting chamber communicating with the lower ends of saidtubes, means to dislodge into said chamberl the dust adhering to theinside of said tubes, means to pass the dust laden hot furnace gasesdown through said tubes to supply heat to the iinid around them andelectrostatic separating means X'tcnding through said tubesserena/itin," the gases passi] n aneonsiy pl.nn-1fi s fw theref 12. infaipaiatir'l; .r apparatus, a boiler pri v'xded with large area tubes, adust. collecting; ,:hainber coimnnnicating with the lower ends of saidtubes, means to dislodge into said chamber alle d ust adhering to theinside of said tubes, means Lo pass the dust laden hot furnace gasesthrough vsaid tubes to supply heat to the iuid around them andelectrostatic sepaating means extending through said tubes separatingdust from the gases passing Ihiough said `tubes and simultaneouslypromoting the transfer of heat therefrom.

i3. In dust separating steam generating apparatus, a boiler providedwith gas tubes, a dust collecting chamber communicating with 4the lowerends of said tubes, means to dislodge into said chamberfthe dustadhering to the inside of said tubes, means to pass the dust laden hotfurnace gases through said tubes to supply heat to Huid around them andelectrostatic separating means separating the dust from the gasespassing through sa id tubes and. simultaneously promoting the transferof heat therefrom. v

il.' ln dust separating steam generating apparatus, a boiler providedwith gas tubes, means to pass hot furnace gases through said tubes tosupply heat to the Huid around them and electrostatic separating meanspromoting the transfer of heat therefrom.

l5. In steam generating apparatus, a container provided with gaspassages, means to pass het, gases through said passages to supply heatto the fluid in said container around said passages and electrostaticmeans promotinc the transfer of heat from said gases.

1.6. tln liquid heating apparatus, a liquid heater provided withsubstantially vertical gas passages, means to pass hot gases throughsaid passages to supply heat to the fluid around them and electrostaticmeans in said passages promoting the transfer of heat from said gases.

17. VIn liquid heating apparatusfa heater iii-vided with passages, meansto pass hor, gases through said passages to supply to the fluid aroundthem and electroi c means promoting the transfer of heat Wi tnesses z AHARRY L. DUNCAN, Jessie B. KAY.

